--group 5 disk 43    --<< 组号为5的diskgroup，磁盘号为43

从v$asm_disk的字段HEADER_STATUS看一下这个块盘状态对不对。

你现在单节点重启正常吗，是不是实例已经起来了

单节点重启正常，只是不定时的这个节点就会重启。

怀疑是硬件问题，找存储厂商说硬件没有报错。

重启正常说明现在磁盘权限啥的没问题了，但是从报错看应该是磁盘的问题，比如抖动了一下，那你可以再看看asm的alertlog有没有更多信息，系统的message看看有没有存储方面的报错。

可以问问存储工程师，出问题时存储方面有没有报错。

asm的alertlog  和操作系统的message也没有报错信息。

参考一下这篇mos吧Database Crash With ORA-27063 and OS Error: 5: I/O Error (Doc ID 877549.1)

CAUSE

This is due to a problem with the I/O subsystem.

Issues of this nature are common when there is a problem in the I/O subsystem.
This can include, but is not limited to:

• A bad sector on disk
• An I/O card that is starting to fail
• A bad array cable
• An interruption in network connectivity, in the case of NFS mounts
• Could also be caused by a OS level bug.
• etc.

Review the OS Messages file as this will almost certainly reflect errors (for example   Error for Command: write(10) )

SOLUTION

Open a ticket with the disk hardware vendor to

• run diagnostics on the disk where the problematic file resides and
• investigate / resolve the cause of the I/O error

收到，多谢@摸摸鱼